int
foo(int k)
{
    if (k < 1 || k > 2) {
        printf("out of range\n");
        printf("this function requires a value of 1 or 2\n");
    } else {
        printf("Switching\n");
        switch (k) {
        case 1:
            printf("1\n");
            break;
        case 2:
            printf("2\n");
            break;
        }
    }
}